Saudi Arabia said on Tuesday that it shot down drones fired by Iran-backed militias in Iraq for a second day, while Iran-backed Houthi rebels in Yemen claimed to have forced a Saudi oil tanker to turn around as part of their self-styled blockade of the kingdom.The attacks underscored lingering tensions despite a period of calm between the United States and Iran, neither of which has announced attacks for days following weeks of escalation over the Strait of Hormuz.The Saudi Defence Ministry...